Wiring question: watching cable in another room
I have a home theater that doesn't have a cable box because it's mainly for movies, netflix, AppleTV.
However, when I bring a bunch of people over to see NFL games or MLB playoffs, I'd like to watch it on the 150" screen with surround sound.
My current process is seemingly needlessly complex, but I don't feel the need to rent another cable box for my house. It goes like this:
Unplug the cable box/dvr from the living room, bring it downstairs. Unplug the cable signal booster that Xfinity provided me with and bring that upstairs. Plug in the signal booster where my cable box once was and vice versa. Then go outside to the house source box and switch the living room line with the basement line so the power goes to the right spot and the video goes to the box again. Needless to say, it's a pain.
Is there a way for me to have the box signal show on both lines? Of course only one channel could be seen, but it would make it so I don't have to do so much swapping.
If not, is there a way I could still boost the house (internet, phone, cable) and just move the box?
Hopefully I'm being clear, but feel free to ask questions.
Thanks in advance,